But most of the students don't know how, ____. (Completing Sentence) | But most of the students don't know how Completing Sentence

Question: But most of the students don't know how, ____. (Completing Sentence)

Answer: 

1. But most of the students don't know how to do well in English.
2. But most of the students don't know how to speak English well.
3. But most of the students don't know how to run a computer.

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